题目内容：
Foreachblankinthefollowingpassage,therearefourchoicesgivenbelowandmarkedA,B,CandD.ChoosetheonethatismostsuitableandmarkyouranswerbyblackeningthecorrespondingletterontheAnswerSheet.Smoking,whichmaybeapleasureforsomepeople,isaserioussourceofdiscomfortfortheirfellows._51_,medicalauthoritiesexpresstheirconcernabouttheeffectofsmoking_52_thehealthnotonlyofthosewhosmokebutalsoofthosewhodonot.Infact,non-smokerswhomustinvoluntarilyinhale(吸入)theair_53_bytobaccosmokemaysuffermorethanthesmokers_54_.
Smokingisprohibitedinthetheatresandinhallsusedforshowingfilms_55_inlaboratories_56_theremaybeafirehazard(危险).Elsewhere,itisuptoyourgood_57_.
Iam_58_askingyoutomaintain“No-Smoking”inclassroomsandseminarrooms.
Thiswillprovethatyouhavethe_59_healthinmind,whichisveryimportanttoalarge_60_ofourstudents.
__________
A.Still
B.Further
C.More
D.Again
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答案解析：